Socket for electric lamps



l April 7; 1112's,y

socxET Fon ELECT'RLG LAMPS Filed un. 2v. 1921- i?? "www D e Ill'o IIN hInventor:

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Patented Apr. 7, 192.5'.

UN ITED .STATES P AT EN T l @F.FLICE EUGENE A. SNOW, OF RIVER FOREST,ILLINOIS.

SOCKET FORELEGTR-IC LAMPS.

Application filed .TJecember 27, 1921.

To all win/rm #may concern.'

Be 1t known that I, 'EUGENE A. Snow, a citizen of the United States,residing at 'River Forest, in the county of Cook and which LettersPatent of the United StatesV were granted to me November 8, 1921, Number1,396,294, and to electric lamps which heretofore have been in somecases so constructed that when it was desired to focus incandescentelectric lamps used in reflectors, particularly of automobiles, it wasnecessary to loosen a set-screw and adjust the lamp in the desiredposition, and then tighten the screw again. This, considering theposition of the reflector, took both time and labor.

The object of vmy invention is to provide a simple and comparativelyinexpensive i1nprovement to the socket of the lamp, w iereby such anadjustment of the lamp can be accomplished easily and quickly by handthrough the medium of a projecting handle, substantially as hereinafterfully explained and as particularly pointed out in the claims.

ln the drawings:

Figure 1 is a longitudinal central section of a lamp socket embodying myimprove* ments and the reflector attached thereto and a side view of alamp adjustably inserted therein.

Figure 2 is a transverse section of the same taken on dotted line 2, 2,Figure 1, looking in the direction indicated by the arrows.

Figure 3 is a side view of the upper broken away portion of thereflector socket holder and lamp socket, shown in Figure 1.

Figure l is a detail view showing a central section of the socketholder.

In the drawings A represents an electric incandescent lamp constructedin the usual manner and provided with what is known to the trade as anEdison base, B, that is, a cylindrical base or plug having one, or,usually two diametrically opposite short pins Z), t, projectingtherefrom. When in use the base of the lamp is inserted initscylindrical metallic socket C, and these pins enter bayonet slots c andmove longitudiserial No. 524,851.

nally therein to the ends of said slots, and

the lamp is then turned on its axis to cause tbc pins to enter thelateral portions of the slots, in which they are retained by thepressure of a yielding electrode.

My improvements employ the samelamps and sockets now in extensiveluse,butvthe tubular boss or holder D in which said socket C is secured isconstructed differently. rthis metallic boss D, has the annular edge ofthe central opening of a reflector E seated and secured in acircumferential groove,

or annular rabbet e, made nextl the outer end of said boss,substantially as shown inthe drawings, but the reflector may be securedthereto in any other manner, or the boss may be used in conjunction withany other form of a reflector.

The dia-meter of the entrance of the bore of the boss, at its front end,is but slightly' greater than the circumference of the socket C, but tothe rear of said front entrance the bore is increased in diameter andforms a seat f for a coilesprine', F. The rear convolution of thisspring is seated in an annular groove f/ made in said bore, and the rearend thereof is bent outwards and enters and is secured in a suitableperforation G in the wall of the boss. The front end of the spring isunsecured and the normal diameter of the bore yof the spring is slightlyless, say, one thousandth of an inch than the Outer circumference of thesocket. This spring F is turned radially or transversely outwards andpasses through a segmental slot it in the holder D and on the outside ofthe same has a handle H, securely fastened thereon, which latter can beengaged by` the fingers and pushed to the right whenever it is desiredto loosen the coils of the spring.

In operation the socket can be easily inserted in boss D by properlymanipulating the handle H to expand the spring. It can be locked byreleasing the hold on the handle, and can thereby be retained in anyposition to which it may be adjusted.

It will be obvious to others that modilications and other adaptations ofmy invention may be made without departing from the principles or scopeof the claims, and I therefore desire it understood that all suchchanges or uses are fully contemplated within said claims.

lVhat I claim as new is:

1. The combination of an electric lamp socket, a holder therefor, saidholder comprising a hollow cylinder having a peripheral circumferentialelongated slot, a helical spring disposed Within said holder andsurrounding said socket, one end of said spring being anchored to saidholder, the other end of said spring being free, and a lug integral withsaid free end projecting through said slot, the tension of the springbeing such that the lug tends to move towards one end of the slot,whereby the spring grips the said socket, and manual movement ot the lugtowards the other end of said slot tends to unwind the spring andthereby permit free movement or the socket.

2. In a focusing device for electric lamps, a tubular boss haring`adjacent to one end an external recess, a reflector which is iii;- edlyattached to the boss a part thereof -being seated in said recess, aninternal shoulder located adjacent to the end of the boss having theexternal recess, the boss having' a circumferential elongated slotadjacent the internal shoulder and an internal recess adjacent theopposite end of the boss, a helical spring` maintained Within the bossby engagement at one end with the internal recess, a tubular lamp socketthat is maintained in place by frictional engagement with the innersurfaces of the helical spring",

and a lng integral With the other end ot' said spring and passing,-through the slot, whereby Jthe spring may he unwound so as to permitfree movement ot the said socket,

In Witness whereof I hereunto set my hand this 13th day o1" December,1921.

EUGENE Ae. SFOV.

.litnesses VIOLET TNARDELL, ALEXANDRA A. BALE.

